In this Monday, Jan. 7, 2019, photo provided on Tuesday, January 8, 2019 by the North Korean government, North Korean leader Kim Jong Un walks with his wife Ri Sol Ju at Pyongyang Station in Pyongyang, North Korea, before leaving for China. Kim left for China for a four-day trip, the North's state media reported Tuesday, amid speculation that he may attempt to coordinate his positions with Beijing ahead of his likely summit with U.S. President Donald Trump. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. Korean language watermark on image as provided by source reads: “KCNA” which is the abbreviation for Korean Central News Agency. (Photo by Korean Central News Agency/Korea News Service via AP Photo)

A sedan which is believed to carry North Korean leader Kim Jong Un leaves a train station with a convoy in Beijing, China, Tuesday, January 8, 2019. North Korean leader Kim Jong Un is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (Photo by Ng Han Guan/AP Photo)

A woman prays during the Orthodox Christmas service at Kazan Cathedral in Saint Petersburg, Russia January 6, 2019. (Photo by Anton Vaganov/Reuters)

Orthodox archbishop Teodosie gestures after climbing on a drinking water tank to bless the water in the Black Sea port of Constanta, Romania, Saturday, January 5, 2019. More than 200 thousand bottles were filled with holy water as Orthodox Romanians prepare to celebrate epiphany on Jan. 6. (Photo by Vadim Ghirda/AP Photo)

In this Saturday, January 6, 2018, picture, Bosnian Serb women, seen through flames, attend a ceremonial burning of dried oak branches during the Orthodox Christmas eve religious service at the Orthodox church in the Bosnian capital, in Sarajevo, Bosnia. Like many other Orthodox Christians around the world, Serbs observe holidays according to the Julian calendar instead of the Gregorian calendar adopted during the 16th century. That means they celebrate Christmas on Jan. 7 instead of Dec. 25. (Photo by Amel Emric/AP Photo)

A nativity scene at the Ascension Cathedral ahead of a Christmas liturgy in Novosibirsk, Russia on January 6, 2019. The Russian Orthodox Church celebrates Christmas according to the Julian calendar. (Photo by Kirill Kukhmar/TASS)

Worshippers attend a service marking Orthodox Christmas and celebrating the independence of the Orthodox Church of Ukraine at the Saint Sophia's Cathedral in Kiev, Ukraine January 7, 2019. (Photo by Valentyn Ogirenko/Reuters)

Russian President Vladimir Putin (C) fires a cannon at noon as part of a standing tradition, during his visit to the Peter and Paul Fortress, the original citadel of St. Petersburg, Russia, 07 January 2019. (Photo by Alexei Druzhinin/Sputnik/Kremlin Pool/EPA/EFE)

A fan of winter swimming holds a Russian flag during a festive event marking Orthodox Christmas in the Black Sea port of Yevpatoriya, Crimea January 7, 2019. (Photo by Pavel Rebrov/Reuters)

A child stands with other villagers as he smokes a cigarette during Epiphany celebrations in Vale de Salgueiro, northern Portugal, on January 5, 2019. In the village of Vale de Salgueiro, in northern Portugal, children as young as five are allowed to smoke cigarettes according to the local tradition of the Christian Epiphany celebrations. (Photo by Patrícia de Melo Moreira/AFP Photo)

A woman and her son play as waves crash into the seawall, in Beirut, Lebanon, Sunday, January 6, 2019. A strong storm in Lebanon brought cold temperatures and snow to Lebanon's mountains and heavy rainfall, strong winds on the Lebanese coast, paralyzing parts of the Mediterranean country. (Photo by Bilal Hussein/AP Photo)

Participants of the Befana Swimming in Brissago, Switzerland, 06 January 2019. During the traditional “Nodada de la Befana”, the Lago Maggiore in the port of Brissago is traversed for a distance of 80 meters. This year the water temperature was 7 degrees Celsius, the air 14 degrees. (Photo by Samuel Golay/EPA/EFE)

A devotee shelters a replica of Black Nazarene from the drizzle during a parade, two days before the annual procession to celebrate its feast day in Quiapo, Manila, Philippines, January 7, 2019. (Photo by Eloisa Lopez/Reuters)

Devotees pull a chariot as they parade a replica of the Black Nazarene, two days before the annual procession to celebrate its feast day in Quiapo, Manila, Philippines, January 7, 2019. (Photo by Eloisa Lopez/Reuters)

People celebrate the pagan rite called “Kolyadki”, a pagan winter holiday which over the centuries has merged with Orthodox Christmas celebrations in some parts of Belarus, in the village of Abadoutsy, Belarus January 7, 2019. (Photo by Vasily Fedosenko/Reuters)

Peopleeople throw balls at the Ipanema beach during a hot day in Rio de Janeiro, Brazil, 07 January 2019. According to weather reports, temperatures in Rio de Janeiro reached up to 39.6 degrees Celsius. (Photo by António Lacerda/EPA/EFE)

A festival visitor celebrates after attending bare hand fishing in a frozen river during the Hwacheon Sancheoneo Ice Festival at Hwacheon-gun in Gangwon province, South Korea, 05 January 2019. The festival runs under the slogan “Unfrozen Hearts, Unforgettable Memories” from 05 to 27 January 2019. (Photo by Jeon Heon-Kyun/EPA/EFE)

PH Sport's driver Sebastian Loeb races against an airplane during a performance act at the Peru Dakar Rally in Lima, Peru on January 5, 2019. (Photo by Carlos Jasso/Reuters)

Norway's Prime Minister Erna Solberg watches a performance by schoolgirls during her visit to a government-run school in Ghaziabad, on the outskirts of New Delhi, India, January 7, 2019. (Photo by Anushree Fadnavis/Reuters)

A costumed participant poses before the start of “La Vijanera” carnival in Silio in the northern Spanish province of Cantabria on January 6, 2019. The “La Vijanera” winter masquerade, one of the year's first carnivals in Europe, is a colourful celebration involving approximately 60 characters that perform in different acts to bid farewell to the previous year and pave the way to the next. (Photo by César Manso/AFP Photo)

A woman gestures during the Blacks and Whites Carnival, the largest festivity in the southwestern region of the country, in Pasto, Colombia, on January 5, 2019. More than 10,000 artists, craftsmen and revellers take part in the Black and White Carnival, which has its origins in a mix of Andean, Amazonian and Pacific cultural expressions. It is celebrated every year from January 2 to 6 in the city of Pasto and has been on UNESCO's list of intangible cultural heritage since 2009. (Photo by Juan Barreto/AFP Photo)

Dancers perform during the Cambodian People's Party (CPP) ceremony to mark the 40th anniversary of the fall of the Khmer Rouge regime at the National Olympic Stadium in Phnom Penh on January 7, 2019. (Photo by Tang Chhin Sothy/AFP Photo)

Indians watch a huge kite fly during International kite festival in Ahmadabad, India, Sunday, January 6, 2019. Kite flyers from various countries and across India are participating in the festival that is annually held on the Sabarmati riverfront here. (Photo by Ajit Solanki/AP Photo)

A member of a troupe takes part in the Magno parade of the Carnival of Negros y Blancos in Pasto, Colombia, 06 January 2019. (Photo by Mauricio Duenas Castaneda/EPA/EFE)